M. Meselson:
Correct answer: A. DNA replication
- A. DNA replication
- B. Nucleotide
- C. Prokaryotes
- D. 2 nm
Explanation
Matthew Meselson, an American molecular biologist, contributed significantly to our understanding of DNA replication. In 1958, Meselson and Franklin Stahl conducted the famous Meselson-Stahl experiment, which provided evidence for the semi-conservative replication of DNA. This experiment involved labeling DNA with heavy nitrogen (^15N) and then switching to light nitrogen (^14N) and observing the distribution of the DNA strands in subsequent generations. Their findings supported the hypothesis that DNA replication occurs semi-conservatively, where each newly synthesized DNA molecule consists of one parental and one newly synthesized strand. Meselson's work thus laid the foundation for our understanding of how DNA replicates.
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About Chromosomes
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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